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PRODID:https://murmitoyen.com/events/vanille/udem/
X-WR-TIMEZONE:America/Montreal
BEGIN:VEVENT
UID:69ddcaf209592
DTSTAMP:20260414T010450
DTSTART:20151112T113000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20151112T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/629454-growing-black-
 holes-from-the-first-seeds-to-active-galactic-nuclei-mar-mezcua-u-of-montr
 eal-cfa
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Growing black holes: from the first seeds to active galactic nuclei
  - Mar Mezcua (U of Montreal / Cfa)
DESCRIPTION:Growing black holes: from the first seeds to active galactic nu
 clei - Mar Mezcua (U of Montreal / Cfa)Résumé: How supermassive black ho
 les form and grow is still one of the long-standing questions in astronomy
 . Supermassive black holes of up to 10^9 solar masses already existed when
  the Universe was less than ~1 Gyr old. To reach this mass in such a short
  time\, they should have started as seed intermediate-mass black holes (IM
 BHs) of 100-10^6 solar masses and grow very fast via accretion and mergers
 . Such IMBHs are the missing link between stellar and supermassive black h
 oles and they should be present in the nucleus of low-mass galaxies and in
  the halos of large galaxies\, e.g. in the form of ultraluminous X-ray sou
 rces (ULXs). In this talk I will present observational evidence that a pop
 ulation of IMBHs in dwarf galaxies similar to those seed black holes popul
 ating the early Universe exists. With the use of large\, deep\, multiwavel
 ength surveys like COSMOS\, these sources are detected up to z~4. I will a
 lso show that\, in the local Universe\, IMBHs can be additionally detected
  as extreme ULXs with powerful radio emission in galaxies having undergone
  a minor merger event. The later supermassive black hole growth can be exp
 lained by the accretion of gas coming from galactic scales. At kpc scales\
 , this gas can be transported to the nuclear regions through galaxy merger
 s\, which can trigger active galactic nuclei (AGN) activity and can be det
 ected in the form of binary AGN. At scales of a few 100 pc\, dust lanes ca
 n be the channels of inflow of material from the outer parts of the galaxy
  to the nuclear region\, as evidenced by the finding that the spiral struc
 ture of the nuclear cold molecular gas traced by ALMA observations correla
 tes with that of the dust. The nuclear dust lanes are in addition able to 
 obscure the nucleus of low-luminosity AGN and to explain the collimation o
 f the ionised gas\, which questions the role of the dusty torus proposed b
 y the Unified Model of AGN. 
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TZID:America/Montreal
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